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Eggs stay "good " in the nest for up to 14 days before hens start to set. So 4 days old, they should be fine. But test them as noted above.
You need to pen up your hens to get them back to laying in the nest boxes, if that was 4 days worth of eggs, at least 4 hens laid in that spot!
The 'float' test isn't going to tell you much if they are only 4 days old.......
.....that test is for older eggs that have lost enough moisture for the air cell to grow large enough to float.
When in doubt, break eggs into a separate dish(instead of into pan or recipe) and give them a good look and sniff.
Agrees confining free range birds until they start laying in the coop nests is a good idea.
Free range birds sometimes need to be 'trained'(or re-trained) to lay in the coop nests, especially new layers. Leaving them locked in the coop for 3-4 days (or longer) can help 'home' them to lay in the coop nests. Fake eggs/golf balls in the nests can help 'show' them were to lay. They can be confined to coop 24/7 for a few days to a week, or confine them at least until mid to late afternoon. You help them create a new habit and they will usually stick with it. ..at least for a good while, then repeat as necessary.